How to measure the density of canvas

The calculation unit of the fabric density of canvas is in metric system, which refers to the number of warp and weft yarns arranged in one square inch. The density directly affects the appearance, feel, thickness, strength, flexural resistance, air permeability, abrasion resistance and thermal performance of the fabric and other physical and mechanical indicators. At the same time, it is also related to the cost of the product and the size of the production efficiency.

There are two methods for measuring the density of warp and weft:

Direct measurement method

The direct measurement method is accomplished by means of a cloth mirror or a fabric density analysis mirror. The length of the scale of the fabric density analysis mirror is 5cm. Below the analysis lens, a long strip of glass is engraved with a red line. When analyzing the fabric density, move the lens to align the red line on the glass and the red line on the scale at the same time. Between the yarns, use this as the starting point, and count the yarns while moving the lens until the 5cm scale line is the same. The number of output yarns multiplied by 2 is the density value of the 10cm fabric.

When counting the number of yarns, the starting point should be the center between the two yarns. If the count reaches the end, it is more than 0.5, and if it is less than one, it should be counted as 0.75; if it is less than 0.5, then Calculated by 0.25. Generally, 3-4 data should be measured for fabric density, and then take the arithmetic average value as the measurement result.

Indirect testing

This method is suitable for fabrics with high density and regular weaves with small yarn characteristics. First, after analyzing the fabric weave and the number of weaving loop warp yarns (the number of weaving weft yarns), then multiplying by the number of weaving loops in 10cm, the product obtained is the warp (weft) yarn density.